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| 型號(hào)： | MC80C52EXXX-12SC |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, CDIP40 |
| 文件頁(yè)數(shù)： | 110/125頁(yè) |
| 文件大?。?/td> | 6456K |
| 代理商： | MC80C52EXXX-12SC |
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42
2486AA–AVR–02/2013
ATmega8(L)
Internal Voltage
Reference
ATmega8 features an internal bandgap reference. This reference is used for Brown-out Detec-
tion, and it can be used as an input to the Analog Comparator or the ADC. The 2.56V reference
to the ADC is generated from the internal bandgap reference.
Voltage Reference
Enable Signals and
Start-up Time
The voltage reference has a start-up time that may influence the way it should be used. The
start-up time is given in Table 16. To save power, the reference is not always turned on. The ref-
erence is on during the following situations:
1.
When the BOD is enabled (by programming the BODEN Fuse)
2.
When the bandgap reference is connected to the Analog Comparator (by setting the
ACBG bit in ACSR)
3.
When the ADC is enabled
Thus, when the BOD is not enabled, after setting the ACBG bit or enabling the ADC, the user
must always allow the reference to start up before the output from the Analog Comparator or
ADC is used. To reduce power consumption in Power-down mode, the user can avoid the three
conditions above to ensure that the reference is turned off before entering Power-down mode.
Table 16. Internal Voltage Reference Characteristics
Symbol
Parameter
Min
Typ
Max
Units
VBG
Bandgap reference voltage
1.15
1.30
1.40
V
tBG
Bandgap reference start-up time
40
70
s
IBG
Bandgap reference current consumption
10
A
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